Connection-box for electric conduits.



J. E. GRAYBILL. GONNEGTION BOX FOR. ELECTRIC connnrrs. APPLICATION FILED MAY 15, 1907.

95 L954. Patented Apr. 12, 1910.

2 SHEETS-SHEET 1.

J. E. GRAYBILL. CONNECTION BOX FOR ELEGTRIG GONDUITS.

ABPLIOATION F ILED MAY 15, 1907.

Patented Apr. 12, 1910.

2 SHEETS-SHEET 2.

JOHN E. GRAYIBILL,0F YORK,-PENNSYLVANIA:

CONNECTION-BOX FOR ELECTRIC CONDUITS.

I Specification of Letters Patent.

Patented Apr. 12', 1910;

Application filed May 15, 1907. Serial No. 373,771.

To all whom it may concern:

Be it known that I, J OHN ELGRAYBILL, a

citizen of the United States, and resident of York, Yorkcounty, State of Pennsylvania, have invented certain new and useful Improvements in Connection-Boxes for Electric Conduits, of which: the following is a specification.

The present invention relates to improvements in connection or junction'boxes for electric wire conduits and has for its object toprovide a simple connection which may be readily detached from the conduit sections connected thereby without requiring any adjustment or manipulation of the latter.

Inthe accompanying drawings, Figure l is an elevation, partly broken away, of two sections of an electric wire conduit connected by a junction box constructed in accordance-with the present invention; Figs. 2, 3 and 4 are transverse sectional views on'the lines 2-2, 3-3 and 4+4 of Fig. 1, respectively; Fig. 5 is a view showing the lockin means detached from the junction box an one section of the latter removed; Fig. 6 is a detail view of one of the locking rings;

Figs. 7 and 8 areperspective views illustrating junction boxes constructed in accordance'with the present invention and of different forms from that shown in Figs. 1 to 5.

Referring to the drawings, 5, 6, designate two sections of an electric wire conduit, which may be of any suitable material, diameter, length, etc.

It is customar to make suchconduit sections in various engths and to connect them at any desired-intervals by junction boxes provided with outlets for branch wires or conduits. Various forms of such boxes have I heretofore been proposed but practical experience has shown that-each is objectionable for some reason. It has been customary to provide the box with a removable cover and to connect such cover with the body of the Such boxes have also been con-.

in order to remove a box from a line of conduits, to take down the entire line or at least the conduit sections directly connected with the bOX'.-

Such objections as experience has shown to exist with'the boxes as heretofore constructed, are avoided bythe present inven tion according to which the body of the box is divided longitudinally into two similar sections, eachhaving atone end a female thread adapted to cooperate with a reduced threaded section 7 on the endof a conduit section. Each section of the box is provided" with a pair of internal ribs 8 which serve as abutments or stops to limit the inward movement of the conduit sections and preferably one of "the sections of the'boxis provided with a plurality of taperedlugs 9 adapted to fit in correspondinglyshaped seats in the othersection when the two sections of the box are brought together. By this arrangementthe sections of the box are always properly related and held against relative lateral movement.

The sections of the box, as shown, are held together by clamping or looking rings 10.

vided at its ends with radially projecting lugs 11 andthe rings 10 are of such-cross Preferably eachsection of the box is pro- 7 sectional area that they maybe slipped on the'box over said lugs; When :the rings are thus placed lIIPOSltlOIl it will be seen that I they are arranged eccentrically to the box and by turning said rings'both sections of the box willbe forced against and held securely in position'on the conduits 5, 6. To facilitate turningthe rings in the manner described, they are preferably provided on both edges with a plurality of marginal notches 12 adapted to be engaged by a suit-- able spanner or other tool.

One of the sections'of the box is provided with any suitable number of outlets 13,

shown in the drawin as having threaded stems screwed intosuitably threaded openings in the walls of the box section.

The box may be made any suitable form. As shown in Figs. 1'to5, the box is of the same general .form as the conduits and the outlets 13 are arranged longitudinally thereof.

In Fig. 7, the outlets 14 are arranged in the conduits connected thereby, which latter however extend in line with eachother'. If

the box is to connect two sections of a conduit with another conduit'extending sub:

stantially at right angles thereto, the form shown Fig. 8 is employed in'which each box section is provided with a side extension 15 having its outer end internally threaded and provided with a radial lug 16 similar.

to the, lug, 11v tr. the construction hereinbe-. fore described.

incident to such a construction of junction box as is herein illustrated and described, will be readily understood and appreciated. As shown in Fig.5 when it is desired to.

open a box constructed in accordance with' this invention it is merely necessary to rotate the clamping rings 10 until theyare 1n a position to release t rings ma then be slipped longitudinally on to the ad acent condults and both box sections will then be free from the conduits and may be easily removed. The clamping or locking rings are therefore always supported either by the boxes or the conduits and may be readily slipped and turned into'position to lock the sectionsof the box together and to the conduits.

It will be evident that the invention is not limited to conduits of any particular type but that a box'constructedin accordance with the present inventioncould be clamped upon the ends of conduit sections whether or not they were threaded as shown in the particular-embodiments of the invention selected for the purpose of illustration.

Having thus described the invention what is claimed and desired to be secured by, Letters-Patent is, a

l. The herein describedjunction box for electric wire conduits comprising a plurality of separable longitudinal sections, one of the sections having a lateral outlet formed therein, and a locking means, the said locking means and box being provided with interengaging relatively inclined surfaces whereby a partial rotation of the locking means will clamp the sections together. j

2. The herein described junction box for electric wire conduits comprising a plurality of separable longitudinal sections, and quick release ring-like clamping means, the said clamping means and box having interengaging surfaces oppositely inclined at such an angle that a partial rotation of the clamping means will clamp the sections together.

3. The herein described junction box for electric wire conduits comprising a plurality j of separable longitudinal sections, and quick release ring like clamping means having e sections of the box and to pass over the lugs 11 thereon. Said tudinally extendin end portions of sai sections forming a part a trio conduit -tion of said box divided longitudinally and 120 such 'anopening therethroiig'has adapts it to pass freely over the end of the box, the

said clampmg'means and box having interengagi'ng surfaces oppositely inclined at such an angle that a partial rotation of the clamping means will secure the sections together; '-"70' -4. Ihe combination with two separated sections of an electric w1re conduit, of a junction box for connecting said conduit-seo-v .tions and I H J tudinally extending,.separabl e SCt10I1 S,, O ];lQ.75 The manner of using and the advantages 1 comprising a plurality of ,longi of said sections having a lateral outlet formed therein, and. a locking ringadapted to surround the conduit.sectionandthebox the said ring and boxhaving. eccentrically arranged surfaces whereby thering when rotated on the box-v will secure the sections thereof together.

5. The combination *with twov separated sections of an electric wire iconduit, of a junction box for connecting S3.ld .0011d11lb sections and comprising a plurality of longitudinally extending separable sections, one of said sections 1 having a lateral outlet formed therein, means for engaging the sec- T tionsof. the boxwith the conduit sections, and clamping-means adapted to surround the conduit sections on the box the. said clamping means and box having interengaging surfacesoppositely inclined, at such. an angle that a partial rotation of the clamping means will clamp the sections. together)" 6. The combination with. two. separated sections. of an electric wire conduit, of a junction box .for connecting said conduit sections and comprising a plurality of longiseparable sections, 1 the having an; exterior elliptical in crosssection, and a ring having an elliptical interior passing freely overv said part and adapted by a turn thereon to clamp .the sections together.

a 7. The herein described junction box for electric wire circuits comprising .a plurality of separable longitudinal sections and quick release. clampingumeans adapted to pass freely over said sections so as toembrace the same in, clamping position, .the said means and sections being provided with interengaging surfaces. having such relative inclination that a partial rotation of the clampingmeans, will clamp the sections together. H 8. "A clampoing means for-a divided elecox comprising a-tubular por 9. A clamping means for a divided electric conduit box comprising a tubular portion of said box divided longitudinally and In testimonfy whereof I aflix my signature having an. exterior elliptical in cross section in presence 0 two witnesses. the said divided portions being provided 3 with lugs or flanges forming a groove, and I JOHN GLAYBILL' 5 an elliptical ring adapted to pass over said Witnesses:

lugs and to fit in said groove and to clamp I EDWARD J. LoUoKs,

the parts together by turning therein. H. G. Wmsm 

